Practice Problems
Net F = ma
Directions:
On this worksheet, positive horizontal directions are towards the right and positive vertical directions are upwards.
omit
Question 1
What is the net force acting on a 7-kg mass if it is accelerating at a rate of 5 m/sec
^{2}
?
7.14 x 10
^{-1}
nts
0 nts
1.2 x 10
^{1}
nts
3.5 x 10
^{1}
nts
omit
Question 2
What is the magnitude of the frictional force present if a 7-kg mass being pulled by a horizontal force of 6 newtons towards the right experiences an acceleration of -2.14 m/sec
^{2}
?
2.1 x 10
^{1}
nts
1.5 x 10
^{1}
nts
4.01 x 10
^{-1}
nts
3.27 x 10
^{0}
nts
omit
Question 3
A 7-kg mass experiences two vertical forces: 57.5 newtons pulling upward and 68.6 newtons pulling downward. What acceleration does the 7-kg mass undergo?
11.1 m/sec
^{2}
-4.1 m/sec
^{2}
18.0 m/sec
^{2}
-1.6 m/sec
^{2}
omit
Question 4
A 7-kg mass is being pulled towards the right with a rope that has a tension of 42 newtons at an angle of 40 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?
4.6 m/sec
^{2}
6.0 m/sec
^{2}
3.9 m/sec
^{2}
0.7 m/sec
^{2}
omit
Question 5
A 12-gram bullet travelling at 50 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 40 centimeters, what average resistive force did the tree exert upon it?
-1.5 x 10
^{0}
nts
-3.75 x 10
^{2}
nts
-6 x 10
^{-1}
nts
-3.75 x 10
^{1}
nts
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